CFRPをボルト締結した構造部材の振動シミュレーション

久我　聡・川原橋　優希（東京都市大学大学院）・岸本　喜直・小林　志好（東京都市大学）・大野　友暉・有山　大貴（東京都市大学大学院）

炭素繊維強化プラスチック（CFRP）はその優れた比強度と比剛性に加えて異方性を活かした自動車の骨格構造への適用が期待される．本研究ではCFRPをボルト締結した構造部材の固有振動モード及び固有振動数を予測するための有限要素シミュレーション手法を構築し，実際の打撃試験の結果と比較してその有効性を調べた．

CFRTP射出成形品の強度に対する繊維構造の影響

笹本　涼帆・濱田　陸奥樹・西野　創一郎（茨城大学）・早乙女　秀丸・岩澤　健太（茨城県産業技術イノベーションセンター）

軽量・高剛性のCFRTPは用途拡大が進む一方，成形条件によって繊維構造が変化し強度が不均一となる．本研究では，強度評価とX線CT観察，配向解析により，繊維構造が強度に及ぼす影響を報告する．

Development of Recyclable Thermosetting Fiber Reinforced Pultruded Composites for Body Part

Yong Hyeon Shin･Sang Yoon Park･Sang Sun Park (Hyundai Motor)･Jong Hyun Park (Hanwha Advanced Materials)

This study developed recyclable automotive composites part using easily decomposable thermosetting resins to enable recovery of both fibers and resin. Resin viscosity was analyzed, and composite panels were produced via pultrusion molding. Material properties were evaluated, and a body part called "seat-crossmember" was manufactured to verify formability and performance. Finally, recyclability tests confirmed successful recovery, achieving lightweight and eco-friendly benefits.

A Study on the Damping Characteristics of Engineering Plastics for Achieving Vibration and Noise Performance Suitable for Electric Vehicle Drive Environments

HYUN JUN HYUNJUN KIM KIM (HYUNDAI MOTORS COMAPNY)･YUN SEO HYUNJUN KIM PARK (ASCEND PERFORMANCE MATERIALS)

Traditionally, anti-vibration system has relied on rubber isolators and metallic brackets to control vibrations originating from engines and auxiliary drives. However, with the emergence of electric vehicles (EVs) and the growing emphasis on lightweighting, the materials and design approaches used in anti-vibration systems have undergone rapid transformation. In response to these changes, this study investigates the mechanical and damping properties of a newly developed polyamide (PA) material designed to enable structural components to actively contribute to vibration attenuation, beyond their conventional role as static supports. In particular, the paper validates through experimental data a materials design approach that achieves excellent damping performance while maintaining sufficient structural strength.

A Study on the Performance Evaluation Methods of Ion Exchange Resins for FCEV

HYEONGWON PARK･TAEGEUN KIM･SOOHWAN KIM･HAELEE LEE (Hyundai Motor)

To maintain ultra-low conductivity in FCEV cooling systems, ion exchange resins have been considered as a viable approach. However, their application in automotive systems is not yet well established, and evaluation methodologies suitable for FCEV operating conditions remain underexplored. This study proposes a practical framework to assess the thermal performance of ion exchange resins under realistic temperature environments. Resins were thermally aged at 70 °C and 90 °C, followed by measurement of electrical conductivity, pH, and ion exchange capacity. The results indicate noticeable degradation at higher temperatures. Further research should examine mixed-bed interactions and capacity loss without regeneration.

モデルベースによる自動車用ウレタンの発泡予測技術

鞆津　迅（ダイキョーニシカワ）

ウレタン発泡現象に対し，反応物性や発泡挙動の可視化したデータを統合させた発泡モデルを構築し，セル径・連通孔径・空隙率などのセル構造形成をモデルで再現する発泡プロセス予測技術を開発した．本手法により，成形で実現可能な気泡制御条件を事前に導出し，音・熱・外観品質に直結する成形工法の最適化につなげる．